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            <h2 class="title"><a id="transapp"></a>Chapter 12.  Berkeley DB Transactional Data Store Applications </h2>
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        <p>
          <b>Table of Contents</b>
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        <dl>
          <dt>
            <span class="sect1">
              <a href="transapp.html#transapp_intro">Transactional Data Store introduction</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_why.html">Why transactions?</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_term.html">Terminology</a>
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          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_fail.html">Handling failure in Transactional Data Store applications</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_app.html">Architecting Transactional Data
        Store applications</a>
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          <dt>
            <span class="sect1">
              <a href="transapp_env_open.html">Opening the environment</a>
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          <dt>
            <span class="sect1">
              <a href="transapp_data_open.html">Opening the databases</a>
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          <dt>
            <span class="sect1">
              <a href="transapp_put.html">Recoverability and deadlock handling</a>
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          <dt>
            <span class="sect1">
              <a href="transapp_atomicity.html">Atomicity</a>
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          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_inc.html">Isolation</a>
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          <dt>
            <span class="sect1">
              <a href="transapp_read.html">Degrees of isolation</a>
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          <dd>
            <dl>
              <dt>
                <span class="sect2">
                  <a href="transapp_read.html#snapshot_isolation">Snapshot Isolation</a>
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              </dt>
            </dl>
          </dd>
          <dt>
            <span class="sect1">
              <a href="transapp_cursor.html">Transactional cursors</a>
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          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_nested.html">Nested transactions</a>
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          <dt>
            <span class="sect1">
              <a href="transapp_admin.html">Environment
        infrastructure</a>
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          <dt>
            <span class="sect1">
              <a href="transapp_deadlock.html">Deadlock detection</a>
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          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_checkpoint.html">Checkpoints</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_archival.html">Database and log file
        archival</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_logfile.html">Log file removal</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_recovery.html">Recovery procedures</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_hotfail.html">Hot failover</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_journal.html">Using Recovery on Journaling Filesystems</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_filesys.html">Recovery and filesystem operations</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_reclimit.html">Berkeley DB recoverability</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_tune.html">Transaction tuning</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_throughput.html">Transaction
        throughput</a>
            </span>
          </dt>
          <dt>
            <span class="sect1">
              <a href="transapp_faq.html">Transaction FAQ</a>
            </span>
          </dt>
        </dl>
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      <div class="sect1" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h2 class="title" style="clear: both"><a id="transapp_intro"></a>Transactional Data Store introduction</h2>
            </div>
          </div>
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        <p>
        It is difficult to write a useful transactional tutorial and
        still keep within reasonable bounds of documentation; that is,
        without writing a book on transactional programming. We have
        two goals in this section: to familiarize readers with the
        transactional interfaces of Berkeley DB and to provide code
        building blocks that will be useful for creating
        applications.
    </p>
        <p>
        We have not attempted to present this information using a
        real-world application. First, transactional applications are
        often complex and time-consuming to explain. Also, one of our
        goals is to give you an understanding of the wide variety of
        tools Berkeley DB makes available to you, and no single
        application would use most of the interfaces included in the
        Berkeley DB library. For these reasons, we have chosen to
        simply present the Berkeley DB data structures and programming
        solutions, using examples that differ from page to page. All
        the examples are included in a standalone program you can
        examine, modify, and run; and from which you will be able to
        extract code blocks for your own applications. Fragments of
        the program will be presented throughout this chapter, and the
        complete text of the <a class="ulink" href="transapp.cs" target="_top">example
        program</a> for IEEE/ANSI Std 1003.1 (POSIX) standard
        systems is included in the Berkeley DB distribution.
    </p>
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